Spark plug



F. BIZZARRO Feb. 28 1928.

SPARK PLUG Filed Aug. 24, '1927 www,

IN VEN TOR.

Awb

Patented Feb. 2s, 192s.

yUNITED STATES PATENT o FRANK BIzzARRo, or NEW YORK, N. Y., AssrofNoR 'ro EVERKLEEN SPARK PLUGooR- roRATIoN, oF NEW YORK, N. Y.,

A CORPORATION F DELAWARE.

SPARK PLUG.

.This invention relates to spark plugs with particular reference to such as are used for igniting 'gaseous fuel in internal combustion engines as employed in motor cars, etc., the

5 same being partly a continuation and partly 5 improvements on applications filed by Frank Bizzarro on November 26, 1923,`Serial No. 676,978. f

Such plugs have'been, in the past, made. of substantially unitary construction so that after functioning `for a while, they would accumulate a deposit of carbon reducing their eciency;

In order to remove the carbon, it was necessary to either dismantle the plug'entirely or, at least,vdisengage the plug from the cylinder head. V

Another disadvantage of existing devices of this type is that there is no external, visible lmeans to indicate that the plug is not' functioning in a `proper manner, so that if the engine was not running as it should, `it was difficult to locate the fault..

It is therefore the main object of this in-V vention to provide a plug of. the character described in which the body is made of sections permittingv ready dismounting to permit internal cleaning. y

A further object is in the provision of la double-ended reversible electrode, withdrawable as a unit from the lug without disengaging the latter from t e cylinder head of the motor.

A' still further aim is to provide a spark plug so designed as to permit of a minimum amount of carbon accumulating around the electrodes.

Another featureis to Yprovide means whereby the gap between the electrodes ma be readily adjusted to meet varied condl- .,tions. v

These several objects are attained by the novel construction, combination and arrangement `of arts hereinafter described .and illustrated 1n the accompanyin -drawing, forming a material portion of xis disclosure and in which Fig. 1, is a side elevational view of the plug made in accordance with this invention.

Fig. 2, is a vertical sectional view taken approximately through the center line of the same.

.Fig 3, is a fragmentary side elevational vlew showing a modification ofthe electrode carrying cap a's secured tothe body.

`In the drawing, the numeral 5 generally designates a chambered body having threads 6 near its lower end by which the'same is engageable in the cylinder head of a conventional internal combustion engine.

The body is provided with a seat lined with a rubber vgasket 7, on which rests the shoulder 8 of a porcelain insulator 9, held in the body by .a clamping nut 10, contacting with a second rubber gasket 11, on the upper surface of the shoulder 8.

Mounted in the top of the insulator 9 is-a metal brushingf12, moulded into the insula' tor 'and into which is threaded a socket 13 provided with a knurled head, 14, above which is an integral, threaded `stem 15, engageable with a binding nut 16.

The lower converged end of the insulator 9 has moulded therein a second smaller metallic brushing 17, and passing through an axial bore in the insulator, is an electrode 18 FFIcE.

having terminals 19 and screw threaded porp tions 20 intermediate the terminals engageable in\the socket 13 and bushing 17, the electrode being held rigidly by engagement of a small' recess 21, adjacent the inner ends ofthe threaded portion 20, with a pin 22 fixed on the lower end of a spring strip 23 iixed to the socket 13.

-The lower end of the body 5 is provided with a reduced annular band 24, engaging a ring 25, formed on a cap 26 provided with diametrically opposite openings 27 o enly; communicating with the combustion c amber of the cylinder, the cap being held in a rigid position'b athreaded electrode 28 engaglng the ban 24 and ring 25 and having a terminal 29 formed on its inner end spaced lfrom the terminal 19 forming a shght gap therebetween.

The central portion of the body 5 is prof an opening 36 similar to the openings 27A ing improperly.

l A disengaging the one of the elements 34 carrying the electrode :Thus should the engine be functioning im.

ttal withdrawal from the insulator, the electrode may be reversed to present the other termi-nal 19 at its outer end.

From the foregoing it'will be seen a spark plug has been disclosed in whic the several parts are demountable to enable ready cleaning, should the plug be functionthat It will also be noted that the electrodeis s0 made that should one of its terminals become worn, it may be entirely removed without cylinder head an reversed to present a new i terminal.

-I claim as new and While the above is erred embodiment of my invention, it 1s to be understood that minor changes may be made without departing from the spirit and scope of the claims hereto appende Having thus described my invention what desire to secure .by Letters Patent 1s:-

1. A spark plug comprising a hollow body, a conical insulator therein, a terminal fixed to extend transversely into said body, a double ended electrode reversibly held in said insulator, and means permitting removal of said electrode from said insulator v without dismantling the plug.

h with said body,

insulator, a socket extending axially through lug as a whole* rom the.

descriptive of the pre 2. A spark plug comprising in combination, a 'chambered body having means for fixed engagement, an insulator removably clamped in said body, a bushing in said insulator, a socket extending axially through said bushing, a reversible electrode adjustably engaged in said socket, a radial electrode entering the chamber in .said body adjacent the lirst named electrode, means in saidbody permitting sparks to be seen, and means on said socket for engaging a conductor.

Y 3,A spark plug comprising in combination a chambered body having a screw threaded hollow base containing openings for visual observation, windows in said openings, an insulator in said body, means for removing said insulator without interfering a bushing clamped in said said bushing, means for removably engaging said socket in .said bushing, means for engaging connections for electric conductors to the extending 'end of 'said socket, an electrode having like ends adjustably and reversibly held in said socket, a cap having lateral ports removably engageable with the lower end of said body, and a-radial elee trode adjustably fixed in the wall of said cap.

4; A spark plug having a reversible electrode removably engaged in the body of the plug, guide sleeves engaging the ends of said electrode, said electro e being providedwith small recesses, a spring strip fixed tofoneof said sleeves, a pin on said strip engaging one of the recesses in said electrode, and a second electrode adjustably arrangedtransversely to the exposed end of saidJ first electrode.

Signed in the city, county, and State of New York, this '30th day'of July, 1,927.

FRANK BIZZARRO. 

